Good Coop Strategy Game

[ThronedFlame]

Two of my friends and I are looking for a coop strategy game to play. We like Stellaris (and have tried other paradox games, but think they might be just a bit too tedious/complex). Would enjoy a game like CoH2, but all the coop scenarios are for 2 players it looks like. Would also like something like the Total War games, but again those are max of 2 players.

Any one have suggestions for good 3 player coop grand strategy or RTS style games?